Calibration weights are known masses such as a 100g or 500g weight. It is important to use the correct calibration weight when calibrating a scale. Otherwise, your scale could become highly inaccurate. For instance, if during calibration, the scale asked for you to place 200g weight on the tray, and you placed 100g instead, your weight readouts on the display would show at twice what their actual weight was. For instance, if you placed 1g on the scale it would say 2g, 4g would say 8g, and so on. Obviously, this is not how you would want your scale to perform. Check availability of weights with your scale supplier, or check here for our Calibration Weights section. Calibration weights do not always come with a scale.